Create flag column for when category has new date

I have a table containing date, audience, advertisement, and spend associated with the audience or ad. I'm looking for a way to flag whether there is a new date for a category (i.e., audience or ad) that begins spending within the last week. For example, if the prospect audience begins spending (spend > 0) on 1/5/26, I want the flag column to return a 1 for the prospect audience because it began spending within the last week (12/31/25 - 1/6/26). If its spend began instead on 12/1/25, then it will return a 0 because it is longer than a week ago. Thanks in advance for the help!